We used this tutorial and used the pull-down resistor diagram – it’s not clear on the web site but it’s the lower of the 2 circuit diagrams. We used GPIO pin 23 instead of 17, but other than that it’s just the same. Using a little breadboard, we connected 1 side of the switch to the 3.3v pin on the RaspberryPi. The other side of the switch is connected via a 1K resistor to RaspberryPi GPIO pin 23, and via a 10K resistor to a GND pin on the Pi.
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